They went with SIPP, which was one of the backwards-compatible options. It should be kind of obvious from the vast number of backwards compatibility methods ava

They went with SIPP, which was one of the backwards-compatible options. It should be kind of obvious from the vast number of backwards compatibility methods available in v6 that v6 is actually backwards compatible... but for some reason a lot of people either refuse to believe this or have double standards around what counts as compatibility.